所谓化归 ,就是根据已有的知识 ,通过观察、联想、类比 ,以及逻辑推理等手段 ,把需要解决的问题转化为已经解决或容易解决的问题 ,即将未知转化为已知的数学思想方法 .实现化归的关键在于善于发现问题之间的内在联系 ,确定化归的模式 ,选择恰当的手段来实现有效的转化 .下面介 The so-called return is based on the existing knowledge, through observation, association, analogy, and logical reasoning and other means, the problems that need to be resolved into a problem that has been solved or easy to solve, that is, the unknown is transformed into a known mathematical thinking method. The key to achieving transformation is to be good at discovering the intrinsic links between problems, determining the patterns of transformation, and choosing the appropriate means to achieve effective transformation.